Exclusive Photos of the One Liberty Observation Deck

Construction on the One Liberty Observation Deck is well underway. Still slated for its grand opening this fall, Philadelphia's newest (and highest) tourist attraction will bring visitors 57 floors (and more than 883 feet) above street level, and offer something a little bit different: developers tell Curbed to expect some sort of "thrill feature." To give you an idea of what this may look like, take a gander at sister attraction 360 Chicago (formerly the John Hancock Observatory), whose "tilt" attraction does just what you imagine it does: it tilts visitors - up to eight at a time - a terrifyingly 30 degrees downward from 1,000 feet in the air.

Offering unparalleled views across Philadelphia and its environs, the tower is located, if you recall, at the top of the first pair of buildings to break the "gentleman's agreement" effectively restricting the height of new construction in Philadelphia to below William Penn's brim —until Liberty Place arrived in the 1987 and broke the mold.

The developer, Montparnasse 56, plans to fully integrate stories of the the building's history into the visitors' experience, as well as offer interactive attractions aimed at tourists of all ages: there's even a giant scamper-friendly William Penn statue planned.

Evan Evans, General Manager of One Liberty Observation Deck says: "Philly has amazing stories to tell to locals and visitors alike. Sharing it from 883 feet above the city is simply spectacular!"

Stay tuned as the expected opening date draws near for more details on what to expect from the deck's thrill feature and its other less terrifying interactive exhibits.

You can also follow along on the Observation Deck's Facebook page, Instagram account, or Twitter handle @PhillyFromTop.